﻿// RankingSejmowy 1.0 - Polish parliment statistics for the masses.
// Copyright (C) 2010 Jarosław Dubrownik
//  
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//  
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//  
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
using System;
using RankingSejmowy.Model.Import;

namespace RankingSejmowy.BLL.Import.Spider.Downloaders
{
    public class CachedWebPageDownloader : ICachedPageDownloader
    {
        private readonly IPageCache _pageCache;
        private readonly IPageDownloader _pageDownloader;

        public CachedWebPageDownloader(IPageDownloader pageDownloader, IPageCache pageCache)
        {
            _pageDownloader = pageDownloader;
            _pageCache = pageCache;
        }

        #region ICachedPageDownloader Members

        public DownloadedPage Download(Uri uri)
        {
            if (_pageCache.IsPageInCache(uri))
            {
                return _pageCache.GetPageFromCache(uri);
            }

            return DownloadAndPlaceInCache(uri);
        }

        public DownloadedPage Download(Uri uri, bool disableCache)
        {
            return disableCache ? DownloadAndPlaceInCache(uri) : Download(uri);
        }

        #endregion

        private DownloadedPage DownloadAndPlaceInCache(Uri uri)
        {
            var page = _pageDownloader.Download(uri);
            _pageCache.SavePageInCache(page);
            return page;
        }
    }
}